You could try volunteering and add a tag or two to your profile (a surname of interest to you, for example).
(I was frustrated for the longest time because I wanted a specific question answered before I completed the signup, but I couldn't complete the signup until I was properly "visible", which I didn't want to be until my questions were answered, so .. loopedy loop.). You may not be in that situation, but I don't think you can add stuff until you're confirmed. (I'm sure someone will come along with a better answer as soon as I post this!)